Final answer:
Ammonium chloride b) is the compound that is made of a strong acid (hydrochloric acid) and a weak base (ammonia), resulting in an acidic solution when dissolved in water.
Step-by-step explanation:
The compound made up of a strong acid and weak base is ammonium chloride (NH4Cl). Ammonium chloride is the product of the neutralization of hydrochloric acid (HCl), which is a strong acid, with ammonia (NH3), which is a weak base.
When ammonium chloride is dissolved in water, the ammonium ion (NH4+) can donate a proton to water, acting as an acid, while the chloride ion (Cl-) does not react with water, as it is the conjugate base of the strong acid HCl. Therefore, the solution becomes acidic.
Here is the chemical reaction:
NH4+ (aq) + H2O(l) -> NH3(aq) + H3O+(aq)